Conduit fitting



Pd 25, 930. R. P. DUNMIRE 1,7 ,545

CONDUIT FITTING Filed 0012'. 30. 1925 a fiINVENTOR.

ATTORNEYS.

Patented Feb. 25. 1930 UNITED STATES.

PATENT OFFICE RUSSELL r. ,DUN IRE; or ERIE, PENNSYLVANIA, AssIeNoR mo ERIE MALLEAIBLE IRON COMPANY. or ERIE, PENNSYLVANIA, A CORPORATION or PENNSYLVANIA ooNmiIT FITTING Application fiIed OctOber 30, 1925. Serial No. 65,822.

This invention is designed to improve conduit fittings adapted for use with threadless conduit and is directed particularly to the improving of means for engaging or locking the fittin with the conduit. Features and details the invention will appear from the specification and claims.

The invention is illustrated in the accompanying drawings as follows n Fig. 1' shows aside elevation of a fitting partly in section.

Fig. 2 a section on the line 2-2 in Fig. 1.

Fig.3 a perspective view of the locking wedge.

Fig. 4 a sectional construction. p 4 g '1 marks thebody of the fitting, which is exemplified'as a conduit box. The box is provided with a conduit extension 2 having a conduit-receiving opening 2 A contractview of an alternative ible sleeve 3 having a longitudinal slit l is arranged in the opening 23 This sleeve has a tapered surface 5 which 1s adapted to engage a sealingring 6 arranged in the opening 2 the sealing ring seating on a shoulder 7 in said openmg. The inner end of the sleeve is. provided with a guard shoulderl8 adapted to cover v sleeve 3 and between the end of the conduit" the end of the inserted conduit A and the sleeve has an exterior shoulder 9., A forked wedge 10 is arranged transversely of the 6 contracts the'sleeve intoenga-gement with I enamel be provided. A cover 11 is secured 1n the ordinary manner by-screws 12 and 15 the conduit. The sleeve has the serrations 3 tomore thoroughly'engage the walls of the conduit and to penetrate the enamel should so positioned as to lock the wedge in place. In the alternativeconstruction "the box has an extension 14 with an opening 15 This opening has a tapered wall through it. 16 adapted to receive-a similar tapered sur-' face on a contractible sleeve 17. The sleeve has a longitudinal slit 18 so as to facilitate I its contraction'anda guard shoulder 19 and looking the wedge in place.

an external shoulder 20. The wedge 10 is driven in behind the shoulder 20, moving the sleeve 17 endwise and contractingthe same I engaged.

3 What I claim as new'is 1. In a conduit fitting, the combination of a body having a conduit-receiving opening; a slotted contractible sleeve in the opening; means in'the opening cooperating with the sleeve and Walls of the opening contracting the sleeveupon an axial movement of the sleeve in the opening; a shoulder. on the. sleeve; and a transverse wedge between the shoulder and the wall of the fitting operating-on the sleeve to move it longitudinally to contract the same into engagement with an inserted conduit. v

2. In a conduit fitting, the combination of. a body having a conduit-receiving opening; a slotted contractible sleeve-in the opening;

means in the openingcooperating with the sleeve and walls of theopening contracting the sleeve upon an axial movement of the sleeve in-the opening; a shoulder on the inner,

end of the sleeve; and a transverse wedge between the shoulder and the wall of the fitting operating on the sleeve to move it longitudinally to contractthe same into enin gagement with an inserted conduit.

3. In a conduit fitting, the combination of abody having'a conduit-receiving opening; a slotted contractible sleeve in the opening; means in the opening cooperating with the sleeve and walls of the opening contracting the sleeve upon an axial movement of the sleeve in the opening; a shoulder on the sleeve; a transverse wedge between the shoulder and the wall of the fitting operating on thesleeve to move it longitudinally to contract the same into engagement with an inserted conduit; and a cover on the fitting In testimony have hereunto set whereof I my hand. 1

RUSSELL P. DUNMIRE. r 

